Fiut, Ignacy S. “The Picture of Sustainable Development in ‘Problemy Ekorozwoju Problems of Sustainable Development’ Journal”. Problemy Ekorozwoju 6, no. 2 (July 1, 2011): 93–100. Accessed July 22, 2024. https://ph.pollub.pl/index.php/preko/article/view/4786.